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Im trying to figure out why the rear end of my 01 330ci does not seem planted, I will try explain it as best as I can as I dont know the right terms.

Previously when I went over a bump at speed it felt like the rear end did not absorb much of the force and after the compression, it felt like it was all over the place. So I checked the rear shocks, and the rear right was blown. So I replaced both shocks.

This made the compression/absorption much better but it was still all over the place after the bump. I checked the RTAB as per the forums, and sure enough they were both in bad shape. After I replaced both of them it feels much much better, however I still feel like after a bump, the tire does not make contact back to the road quick enough or so. Almost feels like its skipping or just not pushing the tire back on to the road fast/hard enough.

I hope that makes sense. Could this be because of the rear springs? What are the symptoms of bad springs? IF not, what else could it be?

I experienced very similar issues once with my E46. Turned out to be blown RTABs, and that solved it. In your case, assuming the RTAB replacements were good quality and installed properly and the alignment was done properly, the next thing I would check are your tires. How old are they, and how's the tread? Have you had your rims balanced recently to check for bends/warping?

Worst case, bring it to a good independent shop (one of the sponsors on this forum) and have them take a look at it. I'd recommend Stance Factory as they're suspension specialists and should definitely help.

I experienced very similar issues once with my E46. Turned out to be blown RTABs, and that solved it. In your case, assuming the RTAB replacements were good quality and installed properly and the alignment was done properly, the next thing I would check are your tires. How old are they, and how's the tread? Have you had your rims balanced recently to check for bends/warping?

Worst case, bring it to a good independent shop (one of the sponsors on this forum) and have them take a look at it. I'd recommend Stance Factory as they're suspension specialists and should definitely help.

I got OEM RTAB's and got it installed at a reputable mechanic, not a sponsor, but a good BMW mechanic. Maybe I should get the alignment checked again. Any recommendations for alignment shops?

My summer tires were new Hankook v12's bought last summer and balanced at Simplytire and the winters are Pirelli Sottozero's about 3 years old now. The rear end behaves the same with both tires so I was thinking it wasn't the tires?

I use Pan Auto in Markham for alignments. (905) 294-8838. Might even be worth mentioning the cause for your visit when you see him in person, perhaps he can take a peek while it's on the machine.

Tell him Anuk referred you.

It's a one man show, but the guy is meticulous and by far the best and most accurate alignment shop I've used, and I've been to several and most weren't good enough or charged obscure rates. I've had several cars done there and some with custom specs to my liking. Perfect job, every single time.